Cool idea Barb
Hopefully the Shepherd will do better than our 2 would.
King Charles - clueless, couldn't pick out a box containing steak.
Labrador - Evil genius, will solve it and pick whatever brings in the most food for the dog - I can guarantee that he'd find low glucose every 20 mins after he'd trained you up (Actually trained SWMBO to give him a biscuit on threat of eating the coffee table - put his jaws on it and stared at her until she gave in).